Change-speed gear.



No. 765,498. PATENTED JULY 19, 1904.

W.. L. MARR.

OHANQE' SPEED GEAR. APPLICATION 2mm AUG. '2, 190a.

N0 MODEL. 2 SHEETS-SHEET 1.

E z .2 l I I E J WITNESSES.

PATENT'ED JULY 19,1904.

w. MARR. OHANGE SPEED GEAR.

'urmourojnnnnn' we. a, 1903".-

2 sums-9min a,

.no norm.

R 0 T A m.

WITNESSES.

Patented July 19, 1904.

UNITED STATES PATENT OFFICE.

WALTER L. MARR, OF DETROIT, MICHIGAN.

CHANGE-SPEED GEAR.

SPECIFICATION forming part of Letters Patent No. 765,498, dated July 19, 1904.

Application filed August 3, 1903. Serial Nol67,966- (No model.) I

To all whom it may concern.-

Be it known that I, WALTER L. MARR, a citizen of the United States of America, residing at Detroit, in the county of Wayne and State of Michigan, have invented certain new and useful Improvements in Change-Speed Gears, of which the following is a specification, ref erence being had therein to the accompanying drawings.

My invention relates to speed-change gearing; and it consists in theimprovements hereinafter described, and pointed out in the claim.

Referring to the accompanying drawings, Figure 1 is a sectional view of a change-speed gearing embodying my invention. Fig. 2 is a section on the line 2 2 of Fig. 1, showing the parts back of the section-plane in elevation and partly broken away.' Fig. 3 is a section on the line 3 3 of Fig. 1, showing the parts back of the section-plane in elevation and partly broken away. Fig. 4c is a section on the line i 4 of Fig. 1, showing the parts back of the section-plane in elevation and partly broken away.

The direction of sight in Figs. 2, 3, and 4 is indicated by arrows adjacent to the figures designating the planes of section in Fig. 1.

A is a constantly-rotating shaft. A, A A and A designate parts rigidly secured to said shaft.

A is a clutch-bearing plate and sleeve secured upon the shaft A by a cotter-pin a.

A is a gear-wheel sleeved upon and secured to the shaft A by a cotter-pin a A indicates the fly-wheel, which is keyed upon the shaft A by the key a.

A is a gear-wheel secured so as to be fixed relatively to the shaft A by pins (0 eXtend.

ing through said gear-wheel into the hub of the fly-wheel A E is a sleeve adapted to rotate about the shaft A and divided into two parts for con venience in assembling, which parts in the assembled device are rigidly secured together by pins 0.

E is a disk upon one end of the sleeve E, the outer edge of which is turned inward to form a horizontal cylindrical surface having internal gear-teeth E E indicates a brake-strap upon the outer surface of the cylindrical portion of the disk E.

E is a gear-wheel upon the end of the cylindrical cavity upon one side of the casing B, the clutches upon the plate A being adapted to contact the interior walls of said cavity to bind the casing B to the disk A, and thereby to the shaft A.

B B are arbors bearing in the cylindrical Walls of the casing B. Upon each of the arbors B B are located two gear-wheels B B*, which are rigidly united together, the larger of said gearwheels, B meshing with the gear-wheel A and the smaller of said gearwheels, 13*, meshing with the gear-wheel E upon the sleeve E.

D is a disk provided with a cylindrical portion at its outer edge and sleeved upon the hub of the fly-wheel A* so as to turn independently thereof.

D is a brake-strap around the cylindricalperiphery of the disk D.

D is an arbor secured upon the disk D and extending within the cylindrical periphery of the disk E.

D is a gear-wheel pivoted upon the arbor D and meshing with the gear-wheel A and with the internal gear E The clutch mechanism is indicated by the reference-letter 0.. As this mechanism is of well-known construction, it is not described in dgetail; but its various parts are indicated The operation of the above-described device is as follows: When the clutch C is operated to unite the casing B with the shaft A, the part E is thereby secured from rotation relative to the shaft A by means of the gearwheels B B meshing with the gear-wheels A and E*-, and the sprocket F, through which the driven part is actuated, is carried at the same angular velocity as the shaft A. When the clutch mechanismC is released and the brake strap B is tightened upon the casing B so as to retain said casing from rotation,.the rotation of the shaft A actuates the gear wheel B which carries with it the gear-wheel B, which actuates the gear-wheel E, carrying with it the sleeve E and the sprocket F, at an angular speed less than that of the shaft A in the proportion that the diameter of the gear-wheel B is less than that of the gear-wheel B When the brake-strap B is released and the brake-strap B is tightened upon the cylindrical portion of the disk D so as to restrain said disk from rotation, the rotation of the shaft A actuates the gearwheel D by means of the gear-wheel A the gear-wheel D meshes with the internal gearteeth E upon the disk E and actuates said disk in a direction of rotation opposite that of the shaft A, and the disk E carries with it the sprocket-wheel F, which gives the reverse motion to the driven mechanism. When the brake-strap E is tightened upon the cylindrical portion of the disk E, said disk, and consequently the sprocket wheel F, rigidly united thereto, is thereby restrained from rotation, and the brake-strap E therefore serves as a brake to stop the mechanism.

What I claim is The combination of a driving part having a gear-wheel with exterior teeth fixed thereon, a driven part having a gear-wheel with exterior teeth fixed thereon, said gear-wheels being of difierent diameters, a member adapted to rotate around the axes of said gear-wheels, planetary gear-wheels pivoted upon an arbor in said member, and meshing with the gearwheels upon the driving and driven parts, means for limiting the motion of said member, a second gear-wheel upon said driving part, a rack upon the driven part, a member adapted to rotate about the axis of the lastmentioned gear-wheel on the driving part, a gear-wheel pivoted upon an arbor upon the last-mentioned rotatable member, means for limiting the motion of said member, and means for limiting the motion of said rack.

In testimony whereof I affix my signature in presence of two witnesses.

WALTER L. MARE. Witnesses:

Lnwrs E. FLANDERs, Or'ro F. BARTHEL. 

